US20170199502A1 - Line power control method and system for unified power flow controller - Google Patents

Line power control method and system for unified power flow controller Download PDF

Info

Publication number
US20170199502A1
US20170199502A1 US15/324,744 US201515324744A US2017199502A1 US 20170199502 A1 US20170199502 A1 US 20170199502A1 US 201515324744 A US201515324744 A US 201515324744A US 2017199502 A1 US2017199502 A1 US 2017199502A1
Authority
US
United States
Prior art keywords
line
valve side
line power
reference value
measured
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
US15/324,744
Other versions
US10250070B2 (en
Inventor
Jie Tian
Lei Pan
Chao Liu
Quanrong Shen
Haiying Li
Yu Lu
Yunlong DONG
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NR Electric Co Ltd
NR Engineering Co Ltd
Original Assignee
NR Electric Co Ltd
NR Engineering Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NR Electric Co Ltd, NR Engineering Co Ltd filed Critical NR Electric Co Ltd
Assigned to NR ELECTRIC ENGINEERING CO., LTD., NR ELECTRIC CO., LTD. reassignment NR ELECTRIC ENGINEERING CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LI, HAIYING, LU, YU, DONG, Yunlong, LIU, CHAO, PAN, LEI, SHEN, QUANRONG, TIAN, Jie
Publication of US20170199502A1 publication Critical patent/US20170199502A1/en
Application granted granted Critical
Publication of US10250070B2 publication Critical patent/US10250070B2/en
Active legal-status Critical Current
Adjusted expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B15/00—Systems controlled by a computer
    • G05B15/02—Systems controlled by a computer electric
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
    • H02J3/1814—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators wherein al least one reactive element is actively controlled by a bridge converter, e.g. unified power flow controllers [UPFC]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/20—Smart grids as enabling technology in buildings sector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/30—State monitoring, e.g. fault, temperature monitoring, insulator monitoring, corona discharge
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof

Definitions

  • the present invention relates to the field of flexible power transmission in a power system, and specially to a line power control method and system for a unified power flow controller.
  • Unified power flow controller is currently the most universal power flow control device. It consists of two identical voltage source converters that are connected by using a common DC port, and can be considered as being formed by one static synchronous compensator (STATCOM) and one static synchronous series compensator (SSSC) connected in parallel. Different control functions such as parallel compensation, series compensation and phase shift can be rapidly implemented separately or simultaneously by simply changing the control law, thereby improving the performance of the power system.
  • STATCOM static synchronous compensator
  • SSSC static synchronous series compensator
  • the basic structure of the UPFC is as shown in FIG. 1 .
  • 1 represents a parallel transformer
  • 2 represents back-to-back voltage source converters
  • 3 represents a series transformer
  • 4 represents a controlled AC line.
  • the UPFC includes a parallel-side converter and one or more series-side converters, and further includes a parallel-side transformer, a series-side transformer, a feeder switch of the parallel-side transformer, a bypass switch of the series-side transformer, and so on.
  • the UPFC can implement multi-objective coordinated control.
  • the parallel-side transformer can control a DC voltage and a voltage or reactive power of an AC grid-tied point
  • the series-side converter can implement terminal voltage, phase-shift control, impedance control, or direct power flow control of the line.
  • UPFCs using different topological converters have different control strategies.
  • existing unified power flow controllers that have found engineering application in the world all use series connection of GTO devices, low-level converter bridges, and transformer multi-structure converters.
  • the converter has a complex structure and poor reliability, and requires high maintenance costs.
  • the control protection system has relatively poor expansibility, portability and maintainability.
  • voltage source converters that consist of novel devices such as IGBT are widely applied in the field of flexible DC transmission.
  • Researches on the control strategy of UPFCs including an IGBT-based low-level converter have been carried out in universities and scientific research institutions in China.
  • the low-voltage converter has a high switching frequency and great loss, and contains a lot of harmonics, and therefore has not found engineering application. Due to the modular feature of a modular multilevel converter (MMC), voltage and capacity levels can be easily expanded, facilitating the engineering application of the UPFC. In addition, the MMC has a relatively low switching frequency, which can reduce the loss of the converter, thereby improving the reliability of the voltage source converter.
  • MMC modular multilevel converter
  • the control strategy includes three sections, that is, a power outer loop, a voltage inner loop, and a current inner loop.
  • the power outer loop controls an output to obtain a reference value of inner loop voltage control.
  • active power and reactive power can be adjusted independently, the control system is complex and has a low reliability, and therefore is not suitable for engineering application.
  • a capacitor is connected in parallel with the series-side converter, a single closed-loop PID is utilized to control a series-side output voltage control system for the UPFC, and a filter capacitor is introduced into the control system, affecting the response speed of controlling power of the line.
  • the UPFC device controls a series-side voltage directly by using the PID, but its transient response to a valve side current is relatively slow, affecting transient control of the UPFC system.
  • An objective of the present invention is to provide a line power control method and system for a unified power flow controller, which are simple, practical, and highly reliable, can rapidly and accurately control the power of a line, and can implement independent decoupling control of active power and reactive power of the line.
  • a line power control method for a unified power flow controller including: generating, by means of outer loop line power control, a valve side current reference valve; generating, by means of inner loop valve side current control, a converter output voltage reference value; and outputting, by means of converter control according to the voltage reference value, a corresponding voltage to control line power.
  • the generating, by means of outer loop line power control, a valve side current reference valve specifically refers to that: calculating a line current instruction by means of the outer loop line power control according to an input power instruction and a measured line alternating voltage, and summing the calculated line current instruction and an output value that is obtained by performing a proportional integral operation on a difference between a line power instruction and measured line power, to obtain an outer loop valve side current reference value.
  • a converter output voltage reference value is calculated by means of the inner loop valve side current control according to the valve side current reference value that is input, a measured valve side alternating current, and a measured valve side alternating voltage.
  • a phase angle of phase A of the measured line voltage is a reference angle of the dq transformation and the dq reverse transformation.
  • the foregoing line power control method for a unified power flow controller is applicable to a unified power flow controller that is based on an MMC structure converter.
  • the foregoing line power control method for a unified power flow controller is applicable to a unified power flow controller whose series side does not include a filter structure.
  • the present invention further provides a line power control system for a unified power flow controller.
  • the control system includes an outer loop line power control unit, an inner loop valve side current control unit, and a converter valve control unit, where the outer loop line power control unit is configured to generate a valve side current reference value, the inner loop valve side current control unit is configured to generate a converter output voltage reference value according to the valve side current reference value, and the converter valve control unit is configured to output a corresponding voltage according to the voltage reference value to control line power.
  • the outer loop line power control unit includes a current instruction calculation module, a first measurement module, a second measurement module, an integrator module, and a summation module, where
  • the first measurement module is configured to measure a line alternating voltage
  • the second measurement module is configured to measure line power
  • the current instruction calculation module is configured to calculate a line current instruction according to an input power instruction and the line alternating voltage that is measured by the first measurement module;
  • the integrator module is configured to perform a proportional integral operation on a difference between the line power instruction and the line power that is measured by the second measurement module;
  • the summation module is configured to sum an output value of the integrator module to an output value of the current instruction module to obtain an outer loop valve side current reference value.
  • the inner loop valve side current control unit includes: a third measurement module, a fourth measurement module, and a calculation module, where
  • the third measurement module is configured to measure a valve side alternating voltage
  • the fourth measurement module is configured to measure a valve side alternating current
  • the calculation module is configured to calculate the converter output voltage reference value according to the valve side current reference value, the actual alternating voltage that is measured by the third measurement module, and the actual alternating current that is measured by the fourth measurement module.
  • the outer loop line power control unit further includes a dq transformation module, correspondingly, after the dq transformation module performs transformation on the alternating voltage, and calculation is performed on the transformed voltage and the line power instruction to obtain a dq component of the line current instruction; and a phase angle of phase A of the measured line voltage is a reference angle of the dq transformation.
  • the inner loop valve side current control unit further includes a dq transformation module and a dq reverse transformation module, where
  • the dq transformation module performs transformation on the measured valve side alternating current and the measured valve side alternating voltage
  • calculation is performed on the transformed current, the transformed voltage, a value of a reactor of a bridge arm, and a dq component of the valve side current reference value to obtain a dq component of the converter output voltage reference value
  • the dq reverse transformation module performs dq reverse transformation on the dq component to obtain the converter output voltage reference value
  • a phase angle of phase A of the measured line voltage is a reference angle of the dq transformation and the dq reverse transformation.
  • the line power control method and system for a unified power flow controller in the present invention can rapidly and accurately control the line power, and can independently control active power and reactive power of a line, and make full use of the feature of the unified power flow controller.
  • the method is simple and has high reliability, and is suitable for engineering application of a unified power flow controller based on an MMC structure.
  • decoupling control of the active power and the reactive power of the line is implemented, and the decoupling control together with constant DC voltage control, reactive power control or constant alternating voltage control of a parallel-side converter form a multi-objective coordination strategy of the unified power flow controller.
  • the present invention is also applicable to line power control of an interline power flow controller (IPFC) and a CSC (convertible static compensator).
  • IPFC interline power flow controller
  • CSC convertible static compensator
  • FIG. 1 is an equivalent structural diagram of a unified power flow controller according to the present invention.
  • FIG. 2 is a principle diagram of a line power control method according to the present invention.
  • the present invention provides a line power control method for a unified power flow controller, outer loop power control performs decoupling control on active power and reactive power of a line, and inner loop AC current control directly control a converter current, so as to improve dynamic performance of the unified power flow controller.
  • FIG. 2 is a diagram of a line power control method for a unified power flow controller according to the present invention.
  • the line power control method for the unified power flow controller uses a dual-loop control strategy, including outer loop power control and inner loop valve side current control.
  • Valve side current reference values I sedref and I seqref are generated by means of the outer loop line power control
  • a converter output voltage reference value U cref is generated by means of the inner loop valve side current control
  • a converter outputs a corresponding voltage according to the voltage reference value to control line power.
  • a line current instruction that includes I Ldref and I Lqref is calculated by means of the outer loop line power control according to an input power instruction that includes P ref and Q ref and a measured line alternating voltage U L ; the calculated line current instruction and output values obtained by performing a proportional integral operation on differences between a line power instruction and measured line power P Line and Q Line are summed to obtain the valve side current reference values I sedref and I seqref .
  • the converter output voltage reference U cref is calculated by means of valve side current control inner loop according to measured valve side alternating currents I sed and I seq and measured valve side alternating voltages U sed and U seq .
  • dq transformation is performed on the measured line alternating voltage, and then calculation is performed on the transformed voltage and the line power instruction to obtain a dq component of the line current instruction.
  • a phase angle of phase A of the measured line voltage is a reference angle of the dq transformation and the dq reverse transformation.
  • the line power control method for a unified power flow controller is applicable to a unified power flow controller that is based on an MMC structure converter and a unified power flow controller whose series-side does not include a filter structure.
  • the present invention further provides a line power control system for a unified power flow controller.
  • the control system includes an outer loop line power control unit, an inner loop valve side current control unit, and a converter valve control unit.
  • the outer loop line power control unit is configured to generate a valve side current reference value
  • the inner loop valve side current control unit is configured to generate a converter output voltage reference value according to the valve side current reference value
  • the converter valve control unit is configured to output a corresponding voltage according to the voltage reference value to control line power.
  • the outer loop line power control unit includes a current instruction calculation module, a first measurement module, a second measurement module, an integrator module, and a summation module, where
  • the first measurement module is configured to measure a line alternating voltage
  • the second measurement module is configured to measure line power
  • the current instruction calculation module is configured to calculate a line current instruction according to an input line power instruction and the line alternating voltage that is measured by the first measurement module;
  • the integrator module is configured to perform a proportional integral operation on a difference between the line power instruction and the line power that is measured by the second measurement module;
  • the summation module is configured to sum an output value of the integrator module to an output value of the current instruction module to obtain an outer loop valve side current reference value.
  • the inner loop valve side current control unit includes: a third measurement module, a fourth measurement module, and a calculation module, where
  • the third measurement module is configured to measure a valve side alternating voltage
  • the fourth measurement module is configured to measure a valve side alternating current
  • the calculation module is configured to calculate the converter output voltage reference value according to the valve side current reference value, the actual alternating voltage that is measured by the third measurement module, and the actual alternating current that is measured by the fourth measurement module.
  • the foregoing outer loop line power control unit further includes a dq transformation module, correspondingly, after the dq transformation module performs transformation on the alternating voltage, and calculation is performed on the transformed voltage and the line power instruction to obtain a dq component of the line current instruction; and a phase angle of phase A of the measured line voltage is a reference angle of the dq transformation.
  • the inner valve side current control unit further includes a dq transformation module and a dq reverse transformation module.
  • the dq transformation module performs transformation on the measured valve side alternating current and the measured valve side alternating voltage
  • calculation is performed on the transformed current, the transformed voltage, a value of a reactor of a bridge arm, and a dq component of the valve side current reference value to obtain a dq component of the converter output voltage reference value
  • the dq reverse transformation module performs dq reverse transformation on the dq component to obtain the converter output voltage reference value
  • a phase angle of phase A of the measured line voltage is a reference angle of the dq transformation and the dq reverse transformation.
  • the dq transformation is transformation that converts three-phase alternating variables from description of three-phase stationary coordinate system into description of three-phase rotating dq coordinate system.
  • the dq reverse transformation is transformation that converts three-phase alternating variables from description of two-phase rotating dq coordinate system into description of three-phase stationary coordinate system.
  • the implementation solutions of the present invention are described for a unified power flow controller that is applied to a single line.
  • the present invention is not limited to a system in which a unified a unified power flow controller is applied to a single line.
  • the present invention is applicable to a unified power flow controller that is applied to a multiple circuit line or that is applied to multiple lines at different drop points of a same transformer substation or of a same bus; and the present invention is also applicable to line power control of an interline power flow controller and a convertible static compensator. Any line power control method for a unified power flow controller in which line power outer loop and valve side current inner loop are used falls within the scope of the present invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Inverter Devices (AREA)
  • Control Of Electrical Variables (AREA)
  • Rectifiers (AREA)

Abstract

A line power control method and system for a unified power flow controller includes outer loop line power control, inner loop valve side current control, and converter valve control. Series-side converter valve side current reference values Isedref and Iseqref are calculated by means of the outer loop line power control according to line power instructions Pref and Qref that are input, a measured line power UL, and measured line power Pline and Qline; a converter output voltage reference value Ucref is calculated by means of the inner valve side current control according to the valve side current reference values that are output by means of the outer loop power control, a measured valve side current, and a measured valve side voltage; and finally, a converter outputs, according to the voltage reference value, a corresponding voltage to control line power to achieve a reference value.

Description

    TECHNICAL FIELD
  • The present invention relates to the field of flexible power transmission in a power system, and specially to a line power control method and system for a unified power flow controller.
    • RELATED ART
  • With the interconnection of large-scale power systems and the application of various novel equipment, power generation and power transmission become more economic and more efficient, and the scale and complexity of the power systems are also increased. In addition, as a large quantity of distributed power generation systems are connected to a power grid, the traditional transmission direction of the power flow from a transmission grid to a distribution grid is reversed. Due to the constantly increasing user load, there is a need of a power flow control method to improve the existing power transmission capacity. The complex power exchange between fast-developing smart grids and power markets requires frequent power flow control.
  • Unified power flow controller (UPFC) is currently the most universal power flow control device. It consists of two identical voltage source converters that are connected by using a common DC port, and can be considered as being formed by one static synchronous compensator (STATCOM) and one static synchronous series compensator (SSSC) connected in parallel. Different control functions such as parallel compensation, series compensation and phase shift can be rapidly implemented separately or simultaneously by simply changing the control law, thereby improving the performance of the power system.
  • The basic structure of the UPFC is as shown in FIG. 1. In FIG. 1, 1 represents a parallel transformer, 2 represents back-to-back voltage source converters, 3 represents a series transformer, and 4 represents a controlled AC line. The UPFC includes a parallel-side converter and one or more series-side converters, and further includes a parallel-side transformer, a series-side transformer, a feeder switch of the parallel-side transformer, a bypass switch of the series-side transformer, and so on. The UPFC can implement multi-objective coordinated control. The parallel-side transformer can control a DC voltage and a voltage or reactive power of an AC grid-tied point, and the series-side converter can implement terminal voltage, phase-shift control, impedance control, or direct power flow control of the line. UPFCs using different topological converters have different control strategies. At present, existing unified power flow controllers that have found engineering application in the world all use series connection of GTO devices, low-level converter bridges, and transformer multi-structure converters. The converter has a complex structure and poor reliability, and requires high maintenance costs. The control protection system has relatively poor expansibility, portability and maintainability. With the continuous development of power semiconductor devices, voltage source converters that consist of novel devices such as IGBT are widely applied in the field of flexible DC transmission. Researches on the control strategy of UPFCs including an IGBT-based low-level converter have been carried out in universities and scientific research institutions in China. However, the low-voltage converter has a high switching frequency and great loss, and contains a lot of harmonics, and therefore has not found engineering application. Due to the modular feature of a modular multilevel converter (MMC), voltage and capacity levels can be easily expanded, facilitating the engineering application of the UPFC. In addition, the MMC has a relatively low switching frequency, which can reduce the loss of the converter, thereby improving the reliability of the voltage source converter.
  • Regardless of terminal voltage control, phase-shift control or impedance control, the final objective of the power system is to change the power flow of the line. Therefore, using the UPFC to control the power of the line the a most direct and most efficient method. For a UPFC using the novel topological structure MMC, researches on the related strategy have been carried out in universities. In the “Control Strategy Simulation of UPFC Based on Modular Multilevel Converters” (Power System Protection and Control, 2012, 40 (3), 74 to 77) by Zhang Zhenhua, et al., a nonlinear system is decoupled by using feedback linearization, variable structure control is introduced after the system is linearized, and design of controllers respectively for the parallel-side and the series-side is completed. The control strategy includes three sections, that is, a power outer loop, a voltage inner loop, and a current inner loop. The power outer loop controls an output to obtain a reference value of inner loop voltage control. Although active power and reactive power can be adjusted independently, the control system is complex and has a low reliability, and therefore is not suitable for engineering application.
  • In the “Study on Control of the Unified Power Flow Controller Based on Modular Multilevel Converter” (Master's theses of China Electric Power Research Institute, 2013, 6) by Zheng Bowen, a capacitor is connected in parallel with the series-side converter, a single closed-loop PID is utilized to control a series-side output voltage control system for the UPFC, and a filter capacitor is introduced into the control system, affecting the response speed of controlling power of the line. In addition, the UPFC device controls a series-side voltage directly by using the PID, but its transient response to a valve side current is relatively slow, affecting transient control of the UPFC system.
  • To improve the speed and accuracy of unified power flow controllers, make full use of the power flow optimization feature thereof, and promote the rapid development of application of unified power flow controllers, it is necessary to provide a line power control method for unified power flow controllers that is more reliable and more suitable for engineering application.
    • BRIEF DESCRIPTION
  • An objective of the present invention is to provide a line power control method and system for a unified power flow controller, which are simple, practical, and highly reliable, can rapidly and accurately control the power of a line, and can implement independent decoupling control of active power and reactive power of the line.
  • To achieve the foregoing objective, the following solutions are used in the present invention:
  • a line power control method for a unified power flow controller, including: generating, by means of outer loop line power control, a valve side current reference valve; generating, by means of inner loop valve side current control, a converter output voltage reference value; and outputting, by means of converter control according to the voltage reference value, a corresponding voltage to control line power.
  • According to the foregoing line power control method for a unified power flow controller, the generating, by means of outer loop line power control, a valve side current reference valve specifically refers to that: calculating a line current instruction by means of the outer loop line power control according to an input power instruction and a measured line alternating voltage, and summing the calculated line current instruction and an output value that is obtained by performing a proportional integral operation on a difference between a line power instruction and measured line power, to obtain an outer loop valve side current reference value. In the foregoing line power control method for a unified power flow controller, the generating, by means of inner loop valve side current control, a converter output voltage reference value specifically refers to that: a converter output voltage reference value is calculated by means of the inner loop valve side current control according to the valve side current reference value that is input, a measured valve side alternating current, and a measured valve side alternating voltage.
  • According to the foregoing line power control method for a unified power flow controller, after dq transformation is performed on the measured line alternating voltage, calculation is performed on a transformed voltage and the line power instruction to obtain a dq component of the line current instruction, correspondingly, a line current instruction that is used for summation is the dq component of the line current instruction.
  • According to the foregoing line power control method for a unified power flow controller, after dq transformation is performed on the measured valve side alternating current and the measured valve side alternating voltage, calculation is performed on the transformed current, the transformed voltage, a value of a reactor of a bridge arm, and a dq component of the valve side current reference value to obtain a dq component of the converter output voltage reference value, and then dq reverse transformation is performed on the dq component to obtain the converter output voltage reference value.
  • According to the foregoing line power control method for a unified power flow controller, a phase angle of phase A of the measured line voltage is a reference angle of the dq transformation and the dq reverse transformation.
  • The foregoing line power control method for a unified power flow controller is applicable to a unified power flow controller that is based on an MMC structure converter.
  • The foregoing line power control method for a unified power flow controller is applicable to a unified power flow controller whose series side does not include a filter structure.
  • The present invention further provides a line power control system for a unified power flow controller. The control system includes an outer loop line power control unit, an inner loop valve side current control unit, and a converter valve control unit, where the outer loop line power control unit is configured to generate a valve side current reference value, the inner loop valve side current control unit is configured to generate a converter output voltage reference value according to the valve side current reference value, and the converter valve control unit is configured to output a corresponding voltage according to the voltage reference value to control line power.
  • According to the foregoing line power control system for a unified power flow controller, the outer loop line power control unit includes a current instruction calculation module, a first measurement module, a second measurement module, an integrator module, and a summation module, where
  • the first measurement module is configured to measure a line alternating voltage;
  • the second measurement module is configured to measure line power;
  • the current instruction calculation module is configured to calculate a line current instruction according to an input power instruction and the line alternating voltage that is measured by the first measurement module;
  • the integrator module is configured to perform a proportional integral operation on a difference between the line power instruction and the line power that is measured by the second measurement module; and
  • the summation module is configured to sum an output value of the integrator module to an output value of the current instruction module to obtain an outer loop valve side current reference value.
  • According to the foregoing line power control system for a unified power flow controller, the inner loop valve side current control unit includes: a third measurement module, a fourth measurement module, and a calculation module, where
  • the third measurement module is configured to measure a valve side alternating voltage;
  • the fourth measurement module is configured to measure a valve side alternating current; and
  • the calculation module is configured to calculate the converter output voltage reference value according to the valve side current reference value, the actual alternating voltage that is measured by the third measurement module, and the actual alternating current that is measured by the fourth measurement module.
  • According to the foregoing line power control system for a unified power flow controller, the outer loop line power control unit further includes a dq transformation module, correspondingly, after the dq transformation module performs transformation on the alternating voltage, and calculation is performed on the transformed voltage and the line power instruction to obtain a dq component of the line current instruction; and a phase angle of phase A of the measured line voltage is a reference angle of the dq transformation.
  • According to the foregoing line power control system for a unified power flow controller, the inner loop valve side current control unit further includes a dq transformation module and a dq reverse transformation module, where
  • correspondingly, after the dq transformation module performs transformation on the measured valve side alternating current and the measured valve side alternating voltage, calculation is performed on the transformed current, the transformed voltage, a value of a reactor of a bridge arm, and a dq component of the valve side current reference value to obtain a dq component of the converter output voltage reference value, and then the dq reverse transformation module performs dq reverse transformation on the dq component to obtain the converter output voltage reference value; and
  • a phase angle of phase A of the measured line voltage is a reference angle of the dq transformation and the dq reverse transformation.
  • By means of the foregoing solutions, the line power control method and system for a unified power flow controller in the present invention can rapidly and accurately control the line power, and can independently control active power and reactive power of a line, and make full use of the feature of the unified power flow controller. The method is simple and has high reliability, and is suitable for engineering application of a unified power flow controller based on an MMC structure. By means of the present invention, decoupling control of the active power and the reactive power of the line is implemented, and the decoupling control together with constant DC voltage control, reactive power control or constant alternating voltage control of a parallel-side converter form a multi-objective coordination strategy of the unified power flow controller. The present invention is also applicable to line power control of an interline power flow controller (IPFC) and a CSC (convertible static compensator).
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is an equivalent structural diagram of a unified power flow controller according to the present invention; and
  • FIG. 2 is a principle diagram of a line power control method according to the present invention.
    •  DETAILED DESCRIPTION
  • Specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.
  • The present invention provides a line power control method for a unified power flow controller, outer loop power control performs decoupling control on active power and reactive power of a line, and inner loop AC current control directly control a converter current, so as to improve dynamic performance of the unified power flow controller.
  • FIG. 2 is a diagram of a line power control method for a unified power flow controller according to the present invention. The line power control method for the unified power flow controller uses a dual-loop control strategy, including outer loop power control and inner loop valve side current control. Valve side current reference values Isedref and Iseqref are generated by means of the outer loop line power control, a converter output voltage reference value Ucref is generated by means of the inner loop valve side current control, and finally, a converter outputs a corresponding voltage according to the voltage reference value to control line power.
  • According to the line power control method for a unified power flow controller, a line current instruction that includes ILdref and ILqref is calculated by means of the outer loop line power control according to an input power instruction that includes Pref and Qref and a measured line alternating voltage UL; the calculated line current instruction and output values obtained by performing a proportional integral operation on differences between a line power instruction and measured line power PLine and QLine are summed to obtain the valve side current reference values Isedref and Iseqref.
  • According to the line power control method for a unified power flow controller, the converter output voltage reference Ucref is calculated by means of valve side current control inner loop according to measured valve side alternating currents Ised and Iseq and measured valve side alternating voltages Used and Useq.
  • According to the line power control method for a unified power flow controller, dq transformation is performed on the measured line alternating voltage, and then calculation is performed on the transformed voltage and the line power instruction to obtain a dq component of the line current instruction.
  • According to the line power control method for a unified power flow controller, after dq transformation is performed on the measured valve side alternating current and the measured valve side alternating voltage, calculation is performed on the transformed current, the transformed voltage, a value of a reactor of a bridge arm, and a dq component of the valve side current reference value to obtain a dq component of the converter output voltage reference value, and then dq reverse transformation is performed on the dq component to obtain the three-phase alternating voltage reference value of the converter output voltage. According to the line power control method for a unified power flow controller, a phase angle of phase A of the measured line voltage is a reference angle of the dq transformation and the dq reverse transformation.
  • The line power control method for a unified power flow controller is applicable to a unified power flow controller that is based on an MMC structure converter and a unified power flow controller whose series-side does not include a filter structure.
  • In addition, the present invention further provides a line power control system for a unified power flow controller. The control system includes an outer loop line power control unit, an inner loop valve side current control unit, and a converter valve control unit. The outer loop line power control unit is configured to generate a valve side current reference value, the inner loop valve side current control unit is configured to generate a converter output voltage reference value according to the valve side current reference value, and the converter valve control unit is configured to output a corresponding voltage according to the voltage reference value to control line power.
  • The outer loop line power control unit includes a current instruction calculation module, a first measurement module, a second measurement module, an integrator module, and a summation module, where
  • the first measurement module is configured to measure a line alternating voltage;
  • the second measurement module is configured to measure line power;
  • the current instruction calculation module is configured to calculate a line current instruction according to an input line power instruction and the line alternating voltage that is measured by the first measurement module;
  • the integrator module is configured to perform a proportional integral operation on a difference between the line power instruction and the line power that is measured by the second measurement module; and
  • the summation module is configured to sum an output value of the integrator module to an output value of the current instruction module to obtain an outer loop valve side current reference value.
  • The inner loop valve side current control unit includes: a third measurement module, a fourth measurement module, and a calculation module, where
  • the third measurement module is configured to measure a valve side alternating voltage;
  • the fourth measurement module is configured to measure a valve side alternating current; and
  • the calculation module is configured to calculate the converter output voltage reference value according to the valve side current reference value, the actual alternating voltage that is measured by the third measurement module, and the actual alternating current that is measured by the fourth measurement module.
  • The foregoing outer loop line power control unit further includes a dq transformation module, correspondingly, after the dq transformation module performs transformation on the alternating voltage, and calculation is performed on the transformed voltage and the line power instruction to obtain a dq component of the line current instruction; and a phase angle of phase A of the measured line voltage is a reference angle of the dq transformation.
  • The inner valve side current control unit further includes a dq transformation module and a dq reverse transformation module.
  • Correspondingly, after the dq transformation module performs transformation on the measured valve side alternating current and the measured valve side alternating voltage, calculation is performed on the transformed current, the transformed voltage, a value of a reactor of a bridge arm, and a dq component of the valve side current reference value to obtain a dq component of the converter output voltage reference value, and then the dq reverse transformation module performs dq reverse transformation on the dq component to obtain the converter output voltage reference value; and
  • a phase angle of phase A of the measured line voltage is a reference angle of the dq transformation and the dq reverse transformation.
  • The dq transformation is transformation that converts three-phase alternating variables from description of three-phase stationary coordinate system into description of three-phase rotating dq coordinate system. The dq reverse transformation is transformation that converts three-phase alternating variables from description of two-phase rotating dq coordinate system into description of three-phase stationary coordinate system.
  • The implementation solutions of the present invention are described for a unified power flow controller that is applied to a single line. However, the present invention is not limited to a system in which a unified a unified power flow controller is applied to a single line. The present invention is applicable to a unified power flow controller that is applied to a multiple circuit line or that is applied to multiple lines at different drop points of a same transformer substation or of a same bus; and the present invention is also applicable to line power control of an interline power flow controller and a convertible static compensator. Any line power control method for a unified power flow controller in which line power outer loop and valve side current inner loop are used falls within the scope of the present invention.
  • It should be finally noted that the above embodiments describe the technical solutions of the present invention, but are not intended to limit the present invention. A person of ordinary skill in the art should understand that variations or equivalent replacements can be made to the specific embodiments of the present invention by a person skilled in the art, and such variations or replacements shall all fall within the protection scope of the appended claims.

Claims (14)

1. A line power control method for a unified power flow controller, comprising:
generating, by means of outer loop line power control, a valve side current reference valve; generating, by means of inner loop valve side current control, a converter output voltage reference value, according to the valve side current reference value; and outputting, by means of converter valve control according to the voltage reference value, a corresponding voltage to control line power, wherein
the generating, by means of outer loop line power control, a valve side current reference valve specifically refers to that: calculating a line current instruction by means of the outer loop line power control according to an input power instruction and a measured line alternating voltage, and summing the calculated line current instruction and an output value that is obtained by performing a proportional integral operation on a difference between a line power instruction and measured line power, to obtain an outer loop valve side current reference value; and
the generating, by means of inner loop valve side current control, a converter output voltage reference value specifically refers to that: calculating the converter output voltage reference value by means of the inner valve side current control according to the valve side current reference value that is input, a measured valve side alternating current, and a measured valve side alternating voltage.
2. (canceled)
3. (canceled)
4. The line power control method for a unified power flow controller according to claim 1, wherein after dq transformation is performed on the measured line alternating voltage, calculation is performed on the transformed voltage and the line power instruction to obtain a dq component of the line current instruction, correspondingly, a line current instruction that is used for summation is the dq component of the line current instruction.
5. The line power control method for a unified power flow controller according to claim 1, wherein after dq transformation is performed on the measured valve side alternating current and the measured valve side alternating voltage, calculation is performed on the transformed current, the transformed voltage, a value of a reactor of a bridge arm, and a dq component of the valve side current reference value to obtain a dq component of the converter output voltage reference value, and then dq reverse transformation is performed on the dq component to obtain the converter output voltage reference value.
6. The line power control method for a unified power flow controller according to claim 2, wherein a phase angle of phase A of the measured line alternating voltage is a reference angle of the dq transformation.
7. The line power control method for a unified power flow controller according to claim 3, wherein a phase angle of phase A of the measured line alternating voltage is a reference angle of the dq transformation and the dq reverse transformation.
8. The line power control method for a unified power flow controller according to claim 1, wherein the line power control method is applicable to a unified power flow controller that is based on an MMC structure converter.
9. The line power control method for a unified power flow controller according to claim 1, wherein the line power control method is applicable to a unified power flow controller whose series side does not include a filter structure.
10. A line power control system for a unified power flow controller, the control system comprising an outer loop line power control unit, an inner loop valve side current control unit, and a converter valve control unit, wherein the outer loop line power control unit is configured to generate a valve side current reference value, the inner loop valve side current control unit is configured to generate a converter output voltage reference value according to the valve side current reference value, and the converter valve control unit is configured to output a corresponding voltage according to the voltage reference value to control line power:
the outer loop line power control unit comprises a current instruction calculation module, a first measurement module, a second measurement module, an integrator module, and a summation module, wherein
the first measurement module is configured to measure a line alternating voltage,
the second measurement module is configured to measure line power,
the current instruction calculation module is configured to calculate a line current instruction according to an input line power instruction and the line alternating voltage that is measured by the first measurement module,
the integrator module is configured to perform a proportional integral operation on a difference between the line power instruction and the line power that is measured by the second measurement module, and
the summation module is configured to sum an output value of the integrator module to an output value of the current instruction module to obtain an outer loop valve side current reference value; and
the inner loop valve side current control unit comprises: a third measurement module, a fourth measurement module, and a calculation module, wherein
the third measurement module is configured to measure a valve side alternating voltage;
the fourth measurement module is configured to measure a valve side alternating current; and
the calculation module is configured to calculate the converter output voltage reference value according to the valve side current reference value, the valve side alternating voltage that is measured by the third measurement module, and the valve side alternating current that is measured by the fourth measurement module.
11. (canceled)
12. (canceled)
13. The line power control system for a unified power flow controller according to claim 8, wherein the outer loop line power control unit further comprises a dq transformation module, and correspondingly, after the dq transformation module performs transformation on the measured line alternating voltage, and calculation is performed on the transformed voltage and the line power instruction to obtain a dq component of the line current instruction; and a phase angle of phase A of the measured line alternating voltage is a reference angle of the dq transformation.
14. The line power control system for a unified power flow controller according to claim 8, wherein the inner loop valve side current control unit further comprises a dq transformation module and a dq reverse transformation module;
correspondingly, after the dq transformation module performs dq transformation on the measured valve side alternating current and the measured valve side alternating voltage, calculation is performed on the transformed current, the transformed voltage, a value of a reactor of a bridge arm, and a dq component of the valve side current reference value to obtain a dq component of the converter output voltage reference value, and then the dq reverse transformation module performs dq reverse transformation on the dq component to obtain the converter output voltage reference value; and
a phase angle of phase A of the measured line alternating voltage is a reference angle of the dq transformation and the dq reverse transformation.
US15/324,744 2014-07-10 2015-01-22 Line power control method and system for unified power flow controller Active 2035-08-13 US10250070B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201410328092 2014-07-10
CN201410328092.6 2014-07-10
CN201410328092.6A CN104052073B (en) 2014-07-10 2014-07-10 Line power control method and system for unified power flow controller
PCT/CN2015/071273 WO2016004756A1 (en) 2014-07-10 2015-01-22 Line power control method and system of unified power flow controller

Publications (2)

Publication Number Publication Date
US20170199502A1 true US20170199502A1 (en) 2017-07-13
US10250070B2 US10250070B2 (en) 2019-04-02

Family

ID=51504606

Family Applications (1)

Application Number Title Priority Date Filing Date
US15/324,744 Active 2035-08-13 US10250070B2 (en) 2014-07-10 2015-01-22 Line power control method and system for unified power flow controller

Country Status (7)

Country Link
US (1) US10250070B2 (en)
EP (1) EP3157122A4 (en)
CN (1) CN104052073B (en)
BR (1) BR112017000504B1 (en)
MX (1) MX360963B (en)
RU (1) RU2663820C1 (en)
WO (1) WO2016004756A1 (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108518307A (en) * 2018-04-03 2018-09-11 北京金风科创风电设备有限公司 Power control method, control device, controller and system of wind generating set
CN108574282A (en) * 2018-05-02 2018-09-25 燕山大学 A kind of flow control method based on the UPFC of nonlinear Control in micro-capacitance sensor
CN108777497A (en) * 2018-07-27 2018-11-09 国网宁夏电力有限公司 A kind of stage type photovoltaic generation is actively engaged in mains frequency adjusting control strategy
US10153640B2 (en) * 2016-11-30 2018-12-11 State Grid Jiangsu Electric Power Research Institute Unified power flow controller and control method thereof
CN109193676A (en) * 2018-08-14 2019-01-11 河海大学 A kind of idle work optimization method of electric system
CN109861240A (en) * 2019-02-03 2019-06-07 武汉理工大学 A kind of control method of the Distributed Power Flow controller based on ADPSS/ETSDAC modeling
US10476269B2 (en) * 2015-08-14 2019-11-12 Board Of Trustees Of Michigan State University Method for independent real and reactive power flow control using locally available parameters
CN111884227A (en) * 2020-07-31 2020-11-03 广东电网有限责任公司 UPFC model parameter adjustment method and system
JP2021525998A (en) * 2018-05-28 2021-09-27 南京南瑞▲継▼保▲電気▼有限公司Ｎｒ Ｅｌｅｃｔｒｉｃ Ｃｏ．， Ｌｔｄ Compensator and its control method and device
US11264794B2 (en) * 2017-12-20 2022-03-01 Nr Electric Co., Ltd Series compensator and control method
CN116544959A (en) * 2023-06-27 2023-08-04 哈尔滨理工大学 Nonlinear control method of photovoltaic unified power flow controller

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104052073B (en) * 2014-07-10 2017-02-01 南京南瑞继保电气有限公司 Line power control method and system for unified power flow controller
CN104267296B (en) * 2014-10-21 2017-02-22 国家电网公司 STATCOM fault diagnosis method based on MMC
CN106058852B (en) * 2016-05-30 2018-08-07 许继电气股份有限公司 A kind of line power control method of THE UPFC
CN105896544B (en) * 2016-05-30 2019-03-05 许继电气股份有限公司 UPFC series connection becomes the power flow transfer control method between its by-pass switch
CN107302220B (en) * 2016-09-14 2019-01-04 南京赫曦电气有限公司 A kind of distributed Voltage and flow control method and its device
CN106961113B (en) * 2017-05-08 2020-01-14 许继集团有限公司 Unified power flow controller system and converter reactive power control method
CN108206529B (en) * 2017-12-29 2021-04-30 国网江苏省电力有限公司经济技术研究院 Method for inhibiting low-frequency oscillation of power system
CN108429264B (en) * 2018-03-28 2021-07-27 南京南瑞继保电气有限公司 Output voltage control device of series compensation equipment
RU2687952C1 (en) * 2018-03-28 2019-05-17 Игорь Григорьевич Крахмалин Power flows control method by means of the voltage vector regulation in the load nodes and device of its implementation
CN108462183B (en) * 2018-03-28 2021-07-27 南京南瑞继保电气有限公司 Line voltage control device of series compensation equipment
CN108539748B (en) * 2018-05-14 2021-04-16 国网江苏省电力有限公司经济技术研究院 Double-circuit line unified power flow controller and control method of series side converter thereof
CN109038687B (en) * 2018-08-30 2020-06-12 上海交通大学 Full-direct-current power flow controller suitable for direct-current power transmission system and control method thereof
CN109980628B (en) * 2019-04-18 2020-08-25 浙江大学 Distributed per unit power coordination control method for multi-voltage-level direct-current power distribution network
CN110768268B (en) * 2019-09-25 2022-09-30 国网江苏省电力有限公司 HVDC power control strategy adjustment method and system considering UPFC operation
CN113098023B (en) * 2020-01-08 2022-09-23 国网宁夏电力有限公司 Improved feedforward control method for series converter of unified power flow controller
CN111525541B (en) * 2020-05-27 2022-05-31 东北电力大学 Three-port direct current power flow controller topological structure with fault removal capability
CN111934289B (en) * 2020-07-01 2022-08-12 南方电网科学研究院有限责任公司 Control method, device, equipment and medium for inverter side valve short-circuit protection action

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU459826A1 (en) * 1972-08-10 1975-02-05 Ленинградский Политехнический Институт Им.М.И.Калинина The method of regulating the flow of active power through the communication line between parts of the power system
ES2158116T3 (en) * 1994-07-22 2001-09-01 Electric Power Res Inst REGULATOR OF A TRANSMISSION LINE THAT INCLUDES A CONTINUOUS CONTROLLED VOLTAGE SOURCE, SENSITIVE TO AN ACTIVE POWER DEMAND AS WELL AS A REACTIVE POWER DEMAND.
AU6542098A (en) * 1998-03-03 1999-09-20 Siemens Westinghouse Power Corporation Apparatus and method for controlling flow of power in a transmission line including stable reversal of power flow
TWI264864B (en) * 2005-04-08 2006-10-21 Univ Chang Gung Power flow calculation method of power grid with unified power flow controller
CN101741094B (en) * 2010-01-25 2013-02-27 株洲变流技术国家工程研究中心有限公司 Turn-off device-based mobile power transmission device
CN101854061B (en) * 2010-04-30 2012-04-25 浙江大学 Circulating-current restraining method for three-phase modular multilevel convertor
CN101924370B (en) * 2010-09-08 2013-01-23 株洲变流技术国家工程研究中心有限公司 Mixed type power quality controlling device
RU2446537C1 (en) * 2010-12-29 2012-03-27 Государственное образовательное учреждение высшего профессионального образования "Санкт-Петербургский государственный горный институт имени Г.В. Плеханова (технический университет)" Device to adjust voltage and transmitted capacity of electric network
CN102412579B (en) * 2011-09-26 2014-03-12 中国电力科学研究院 Harmonic current compensating method based on fast Fourier transform
CN103138255B (en) * 2011-11-25 2015-03-25 沈阳工业大学 Decomposition calculating method of optimal power flow of power system with unified power flow controller
TW201333485A (en) * 2012-02-14 2013-08-16 Hon Hai Prec Ind Co Ltd Examination method of LED light bar
US8848400B2 (en) * 2012-02-15 2014-09-30 General Electric Company System and method for reactive power regulation
WO2013126660A2 (en) * 2012-02-24 2013-08-29 Board Of Trustees Of Michigan State University Transformer-less unified power flow controller
CN103312199B (en) * 2013-05-14 2015-08-26 上海交通大学 The single-phase power factor correcting device that direct net side power controls
CN103414185A (en) 2013-07-26 2013-11-27 南京南瑞继保电气有限公司 Unified power flow controller and control method thereof
CN203352168U (en) 2013-09-16 2013-12-18 国家电网公司 Unified power flow controller (UPFC) based on modularized multi-level converters
CN103647286A (en) * 2013-11-15 2014-03-19 许继集团有限公司 Modularization multi-level converter island switching control method
CN103701131B (en) * 2013-12-31 2015-09-02 武汉大学 The topological structure of modified model SEN transformer and control method
CN104052073B (en) 2014-07-10 2017-02-01 南京南瑞继保电气有限公司 Line power control method and system for unified power flow controller

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10476269B2 (en) * 2015-08-14 2019-11-12 Board Of Trustees Of Michigan State University Method for independent real and reactive power flow control using locally available parameters
US10153640B2 (en) * 2016-11-30 2018-12-11 State Grid Jiangsu Electric Power Research Institute Unified power flow controller and control method thereof
US11264794B2 (en) * 2017-12-20 2022-03-01 Nr Electric Co., Ltd Series compensator and control method
CN108518307A (en) * 2018-04-03 2018-09-11 北京金风科创风电设备有限公司 Power control method, control device, controller and system of wind generating set
CN108574282A (en) * 2018-05-02 2018-09-25 燕山大学 A kind of flow control method based on the UPFC of nonlinear Control in micro-capacitance sensor
JP2021525998A (en) * 2018-05-28 2021-09-27 南京南瑞▲継▼保▲電気▼有限公司Ｎｒ Ｅｌｅｃｔｒｉｃ Ｃｏ．， Ｌｔｄ Compensator and its control method and device
JP7089602B2 (en) 2018-05-28 2022-06-22 南京南瑞▲継▼保▲電気▼有限公司 Compensator and its control method and equipment
CN108777497A (en) * 2018-07-27 2018-11-09 国网宁夏电力有限公司 A kind of stage type photovoltaic generation is actively engaged in mains frequency adjusting control strategy
CN109193676A (en) * 2018-08-14 2019-01-11 河海大学 A kind of idle work optimization method of electric system
CN109861240A (en) * 2019-02-03 2019-06-07 武汉理工大学 A kind of control method of the Distributed Power Flow controller based on ADPSS/ETSDAC modeling
CN111884227A (en) * 2020-07-31 2020-11-03 广东电网有限责任公司 UPFC model parameter adjustment method and system
CN116544959A (en) * 2023-06-27 2023-08-04 哈尔滨理工大学 Nonlinear control method of photovoltaic unified power flow controller

Also Published As

Publication number Publication date
EP3157122A1 (en) 2017-04-19
BR112017000504B1 (en) 2022-05-10
EP3157122A4 (en) 2017-07-26
BR112017000504A2 (en) 2017-11-14
CN104052073A (en) 2014-09-17
RU2663820C1 (en) 2018-08-10
MX360963B (en) 2018-11-21
MX2017000434A (en) 2017-08-21
US10250070B2 (en) 2019-04-02
CN104052073B (en) 2017-02-01
WO2016004756A1 (en) 2016-01-14

Similar Documents

Publication Publication Date Title
US10250070B2 (en) Line power control method and system for unified power flow controller
CN104934989A (en) Reactive power compensation device based on novel modular multilevel topology and control method thereof
CN101950972B (en) SVC composite control method based on rapid equivalent susceptance calculation
CN101699694B (en) Three-phase three-wire dynamic split-phase reactive power compensation device and control method thereof
CN103326611A (en) Controlling method for predicting direct power of three-phase voltage source type PWM converter
Neukirchner et al. Voltage unbalance reduction in the domestic distribution area using asymmetric inverters
CN102354991A (en) Direct power control method of three-phase static reactive-power synchronous compensator
CN108075491A (en) The power quality treatment method of APF, SVC combination based on micro-grid energy storage system
Zhang et al. Three-phase four-leg inverter based on voltage hysteresis control
CN106300435A (en) Isolated microgrid single-phase multi-inverter parallel system and distributed control method thereof
Pires et al. HVDC transmission system using multilevel power converters based on dual three-phase two-level inverters
CN104466968A (en) DSTATCOM negative-sequence current cross coupling compensation control method
Gade et al. Recent trends in power quality improvement: Review of the unified power quality conditioner
CN109510223A (en) A kind of three-phase current unbalance administers controller, device and control method
CN108964501B (en) A kind of voltage source inverter control method
Menniti et al. An hybrid PV-wind supply system with D-Statcom interface for a water-lift station
CN106300340B (en) A kind of flexibility multimode switching device and its control method
CN109787258B (en) Control system and method for negative sequence current of V/V traction power supply system
CN204858577U (en) Reactive power compensator based on two many level of H bridge modularization transverters
Deshpande et al. Different modeling aspects and energy systems of unified power quality conditioner (UPQC): an overview
CN201556947U (en) Three-phase three-wire dynamic split-phase reactive power compensation device
CN102694385A (en) Phase current balancing and amplitude-limiting method for asymmetrical compensation of line current of distribution static compensator (D-STATCOM)
Singh et al. A new 24-pulse STATCOM for voltage regulation
CN204992594U (en) Reactive power compensator based on novel many level of modularization topological structure
Hu et al. VSC-HVDC Power Control Strategy for Improving Voltage Stability of AC-DC Power Grid

Legal Events

Date Code Title Description
AS Assignment

Owner name: NR ELECTRIC ENGINEERING CO., LTD., CHINA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TIAN, JIE;PAN, LEI;LIU, CHAO;AND OTHERS;SIGNING DATES FROM 20161220 TO 20170103;REEL/FRAME:040889/0131

Owner name: NR ELECTRIC CO., LTD., CHINA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TIAN, JIE;PAN, LEI;LIU, CHAO;AND OTHERS;SIGNING DATES FROM 20161220 TO 20170103;REEL/FRAME:040889/0131

STCF Information on status: patent grant

Free format text: PATENTED CASE

MAFP Maintenance fee payment

Free format text: PAYMENT OF MAINTENANCE FEE, 4TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1551); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Year of fee payment: 4